(IATA: STL, ICAO: KSTL, FAA LID: STL) St. Louis Lambert International Airport is the largest and busiest commercial airport serving St. Louis, Missouri, USA.

The airport provides nonstop service to airports throughout the United States, Canada, Europe and to sun destinations. In 2023 there were more than 270 daily departures to 80 nonstop domestic and international locations.

The airport has two terminals, five concourses, and 86 gates.

- Terminal 1 contains 36 gates across two concourses, lettered A and C. It also has an American Airlines Admirals Club and one of the nation's largest USO facilities.
- Terminal 2 contains 18 gates across one concourse, lettered E. It also has a public lounge operated by Wingtips. All international flights without border preclearance are processed in Terminal 2.

Runways
The airport has four runways: three parallel and one crosswind. The crosswind runway, 6/24, is the shortest of the four at 7,607 feet (2,319 m). The newest runway is 11/29, completed in 2006 as part of a large expansion program.